d3m0k1d
63 lines
1.5 KiB
Go
63 lines
1.5 KiB
Go
package storage
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import (
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"context"
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"database/sql"
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"fmt"
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"log"
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"time"
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_ "github.com/ClickHouse/clickhouse-go/v2"
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)
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type ClickHouseConfig struct {
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Host string
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User string
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Password string
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Database string
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}
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func OpenClickHouse(cfg ClickHouseConfig) (*sql.DB, error) {
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dsn := fmt.Sprintf("clickhouse://%s:%s@%s/%s",
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cfg.User, cfg.Password, cfg.Host, cfg.Database)
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db, err := sql.Open("clickhouse", dsn)
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if err != nil {
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return nil, fmt.Errorf("clickhouse open: %w", err)
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}
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db.SetMaxOpenConns(5)
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db.SetMaxIdleConns(2)
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db.SetConnMaxLifetime(10 * time.Minute)
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ctx, cancel := context.WithTimeout(context.Background(), 30*time.Second)
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defer cancel()
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if err := db.PingContext(ctx); err != nil {
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db.Close()
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return nil, fmt.Errorf("clickhouse ping: %w", err)
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}
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log.Printf("ClickHouse connected via database/sql: %s", cfg.Host)
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return db, nil
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}
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// OpenClickHouseWithRetry attempts to connect to ClickHouse with retries and backoff.
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func OpenClickHouseWithRetry(cfg ClickHouseConfig, maxRetries int, initialDelay time.Duration) (*sql.DB, error) {
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var lastErr error
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delay := initialDelay
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for i := 0; i < maxRetries; i++ {
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db, err := OpenClickHouse(cfg)
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if err == nil {
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return db, nil
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}
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lastErr = err
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log.Printf("ClickHouse connection attempt %d/%d failed: %v, retrying in %v...", i+1, maxRetries, err, delay)
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time.Sleep(delay)
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delay *= 2
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}
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return nil, fmt.Errorf("clickhouse connection failed after %d attempts: %w", maxRetries, lastErr)
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}
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